import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

/**
 * 构造手机号码和18位code值并写入文件
 */
public class CreatePhoneAndCode {

    //中国移动
    public static final String[] CHINA_MOBILE = {
            "134", "135", "136", "137", "138", "139", "150", "151", "152", "157", "158", "159",
            "182", "183", "184", "187", "188", "178", "147", "172", "198"
    };
    //中国联通
    public static final String[] CHINA_UNICOM = {
            "130", "131", "132", "145", "155", "156", "166", "171", "175", "176", "185", "186", "166"
    };
    //中国电信
    public static final String[] CHINA_TELECOME = {
            "133", "149", "153", "173", "177", "180", "181", "189", "190","191", "193","199"
    };
    public static final String[] CHINA_GD = {
            "192"
    };

    public static void main(String[] args) throws IOException {
        //设置生成文件的路径
        String filePath = "C:\\Users\\EDZ\\Desktop\\data.csv";

        //输入需要生成的数据条数
        int number = 3;
        System.out.println("需要生成数据 : " + number + "条");

        long writeStringToCsvTime = System.currentTimeMillis();
        String dataStr = getCsvDataStr(number);
//        writeStringToCsv(dataStr, filePath, true);
        System.out.println(dataStr);
        System.out.println("已完成数据生成，耗时 : " + (System.currentTimeMillis() - writeStringToCsvTime) + " ms");

    }

    /**
     * 获取写入CSV的数据
     * @return String 写入CSV的内容拼装成一个字符串的
     * csv文件默认以,分割。以换行符来换行，phone和code中添加,以换列，拼接格式为phone为一列数据，code为一列数据
     */
    private static String getCsvDataStr(int num) throws IOException{
        String phone=null;
        String code=null;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < num; i++) {
            phone=createMobile();
            code= getCode(18);
            sb.append(phone).append(",").append(code).append('\r').append('\n');
        }
        return sb.toString();
    }

    public static List<String> gen(int num){
        List<String> list = new ArrayList();
        for (int i = 0; i < num; i++) {
            String phone = createMobile();
            list.add(phone);
        }
        return list;
    }


    /**
     * 生成手机号
     */
    public static String createMobile() {
        StringBuilder sb = new StringBuilder();
        Random random = new Random();
        int op = random.nextInt(4);//随机运营商标志位
        String mobileThree;//手机号前三位
        int temp;
        switch (op) {
            case 0:
                mobileThree = CHINA_MOBILE[random.nextInt(CHINA_MOBILE.length)];
                break;
            case 1:
                mobileThree = CHINA_UNICOM[random.nextInt(CHINA_UNICOM.length)];
                break;
            case 2:
                mobileThree = CHINA_TELECOME[random.nextInt(CHINA_TELECOME.length)];
                break;
            case 3:
                mobileThree = CHINA_GD[random.nextInt(CHINA_GD.length)];
                break;
            default:
                mobileThree = "op标志位有误！";
                break;
        }
        if (mobileThree.length() > 3) {
            return mobileThree;
        }
        sb.append(mobileThree);
        //生成手机号后8位
        for (int i = 0; i < 8; i++) {
            temp = random.nextInt(10);
            sb.append(temp);
        }
        return sb.toString();
    }
    /**
     * 生成code
     * @param length code长度
     */
    private static String getCode( int length) throws IOException {
        String code = "";
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            String str = random.nextInt(2) % 2 == 0 ? "num" : "char";
            if ("char".equalsIgnoreCase(str)) { // 产生字母
                int nextInt = random.nextInt(2) % 2 == 0 ? 65 : 97;
                code += (char) (nextInt + random.nextInt(26));
            } else if ("num".equalsIgnoreCase(str)) { // 产生数字
                code += String.valueOf(random.nextInt(10));
            }
        }
        return  code;
    }



    /**
     * 一次性向CSV写入内容
     * @param dataStr     数据字符串
     * @param csvFilePath 文件路径
     * @param append      是否向已存在的CSV追加内容
     */
//    public static void writeStringToCsv(String dataStr, String csvFilePath, boolean append)  throws IOException {
//        try (FileOutputStream fileOutputStream = new FileOutputStream(csvFilePath, append);
//             OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream, "GBK");
//             BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter)) {
//            // 将数据写入到缓存中
//            if (StringUtils.isNotBlank(dataStr)) {
//                bufferedWriter.write(dataStr);
//            }
//            //把缓存中的数据输出到CSV文件
//            bufferedWriter.flush();
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//    }
}